Synchronous Motors Mcqs
Synchronous Motors Mcqs, this topic has 122 mcqs, It takes five to ten minutes to complete this free Synchronous Motors Mcqs test. You will see 4 or 5 option of each question. You must choose / think only one option and then press on answer key for check right answer. Practice "Synchronous Motors Mcqs" MCQs and share with your friends, brothers, sisters.
Synchronous Motors Mcqs (Total Quiz: 122)
MCQ: In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be____________?
- 3000 r.p.m.
- 1500 r.p.m.
- 750 r.p.m.
- none of the above
B
MCQ: In a synchronous motor, V-curves represent relation between____________?
- armature current and field current
- power factor and speed
- field current and speed
- field current and power factor
A
MCQ: By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
- By changing the supply frequency
- By interchanging any two phases
- By changing the applied voltage
- By changing the load
A
MCQ: The torque angle, in a synchronous motor, is the angle between_______________?
- the supply voltage and the back e.m.f.
- magnetising current and back e.m.f.
- the rotating stator flux and rotor poles
- none of the above
C
MCQ: A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversed
- the motor will stop
- the motor continue to run in the same direction
- the winding of the motor will burn
- the motor will run in the reverse direction
- none of the above
B
MCQ: The net armature voltage of a synchronous motor is equal to the_______________?
- vector sum of Eb and V
- arithmetic sum of Eb and V
- arithmetic difference of Eb and V
- vector difference of Eh and V
D
MCQ: In a synchronous motor, damper windings are provided on____________?
- stator frame
- rotor shaft
- pole faces
- none of the above
C
MCQ: In a 3-phase synchronous motor, the negative phase sequence exists when the motor is_______________?
- supplied with unbalanced voltage
- under-loaded
- over-loaded
- none of the above
A
MCQ: Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current?
- High field current
- Low short circuit ratio
- High core losses
- Low field current
D
MCQ: A rotory converter can also be run as a___________?
- d.c. shunt motor
- d.c. series motor
- d.c. compound motor
- induction motor
- synchronous motor
E